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    Fracture through the thyroid gland — Stock Photo
    Fracture through the thyroid gland
    Pancreatic cells. Colored transmission electron micrograph (TEM) of acinar (exocrine) pancreatic cells (red) adjacent to hormone- secreting (endocrine) Islet of Langerhans cells (yellow) — Stock Photo
    Pancreatic cells. Colored transmission electron micrograph (TEM) of acinar (exocrine) pancreatic cells (red) adjacent to hormone- secreting (endocrine) Islet of Langerhans cells (yellow)
    Normal human renal artery — Stock Photo
    Normal human renal artery
    Pharmaceutical research. Potential new medicines and vaccines on electron micrograph of virus — Stock Photo
    Pharmaceutical research. Potential new medicines and vaccines on electron micrograph of virus
    Section through a wart — Stock Photo
    Section through a wart
    Coloured scanning electron micrograph (SEM) of rods (yellow) and cones (green) in the retina of the eye. — Stock Photo
    Coloured scanning electron micrograph (SEM) of rods (yellow) and cones (green) in the retina of the eye.
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    Quartz crystals structure — Stock Photo
    Quartz crystals structure
    Diatoms single-celled algae — Stock Photo
    Diatoms single-celled algae
    Scorpion fly foot — Stock Photo
    Scorpion fly foot
    Omentum fold of peritoneal membrane — Stock Photo
    Omentum fold of peritoneal membrane
    Cells of brewer yeast — Stock Photo
    Cells of brewer yeast
    Testicular cancer or teratoma — Stock Photo
    Testicular cancer or teratoma
    Candida albicans infected medical catheter — Stock Photo
    Candida albicans infected medical catheter
    Colored scanning electron micrograph of rod-shaped Gram-negative bacteria Escherichia coli, commonly known as E coli. — Stock Photo
    Colored scanning electron micrograph of rod-shaped Gram-negative bacteria Escherichia coli, commonly known as E coli.
    Micrograph of H3N2 influenza virus particles. — Stock Photo
    Micrograph of H3N2 influenza virus particles.
    Healthy human skin — Stock Photo
    Healthy human skin
    Fungal cells and sporangia — Stock Photo
    Fungal cells and sporangia
    Structure of trachea, light micrograph. — Stock Photo
    Structure of trachea, light micrograph.
    Sarcoptic mange mites eggs — Stock Photo
    Sarcoptic mange mites eggs
    Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (green) — Stock Photo
    Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (green)
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light micrograph
    Aphid, light micrograph — Stock Photo
    Aphid, light micrograph
    Deformed sperm cell — Stock Photo
    Deformed sperm cell
    Oesophageal cancer, computer illustration and light micrograph of cancer tissue. — Stock Photo
    Oesophageal cancer, computer illustration and light micrograph of cancer tissue.
    Cross-section through a cotton stem — Stock Photo
    Cross-section through a cotton stem
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar. — Stock Photo
    Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar.
    Orchid (Phalaenopsis sp.) petal, coloured scanning electron micrograph (SEM). — Stock Photo
    Orchid (Phalaenopsis sp.) petal, coloured scanning electron micrograph (SEM).
    Colored scanning electron micrograph of anthrax gram-positive, rod-shaped bacteria known as Bacillus anthracis. — Stock Photo
    Colored scanning electron micrograph of anthrax gram-positive, rod-shaped bacteria known as Bacillus anthracis.
    Lime tree stem — Stock Photo
    Lime tree stem
    Neisseria gonorrhoeae bacterium — Stock Photo
    Neisseria gonorrhoeae bacterium
    Colorectal cancer cell dividing — Stock Photo
    Colorectal cancer cell dividing
    Bacteria found in a sample of human faeces — Stock Photo
    Bacteria found in a sample of human faeces
    Entamoeba gingivalis parasitic pathogen single-celled protozoan, amoeba in oral cavity, digital illustration. — Stock Photo
    Entamoeba gingivalis parasitic pathogen single-celled protozoan, amoeba in oral cavity, digital illustration.
    Bluebottle fly foot — Stock Photo
    Bluebottle fly foot
    House dust mite — Stock Photo
    House dust mite
    Cells undergoing mitosis — Stock Photo
    Cells undergoing mitosis
    Escherichia coli on the surface of human skin — Stock Photo
    Escherichia coli on the surface of human skin
    Coloured scanning electron micrograph of cancer cell from human colon. — Stock Photo
    Coloured scanning electron micrograph of cancer cell from human colon.
    Woodland skipper butterfly compound eye — Stock Photo
    Woodland skipper butterfly compound eye
    Dust mite parasite, microscopic digital illustration. — Stock Photo
    Dust mite parasite, microscopic digital illustration.
    PC12 neurone in culture — Stock Photo
    PC12 neurone in culture
    Myelinated nerve fibres — Stock Photo
    Myelinated nerve fibres
    Coloured scanning electron micrograph (SEM) of immature dog sperm. — Stock Photo
    Coloured scanning electron micrograph (SEM) of immature dog sperm.
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Secondary carcinoma of the lung — Stock Photo
    Secondary carcinoma of the lung
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left). — Stock Photo
    Light micrograph of a section through tissue showing an artery (middle ) and a vein (top left).
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death. — Stock Photo
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death.
    Dental plaque scanning electron micrograph — Stock Photo
    Dental plaque scanning electron micrograph
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Coloured scanning electron micrograph of the rod-shaped, Gram-negative bacteria Escherichia coli, commonly known as E. coli — Stock Photo
    Coloured scanning electron micrograph of the rod-shaped, Gram-negative bacteria Escherichia coli, commonly known as E. coli
    Colored scanning electron micrograph of protective dendritic cell of immune system. — Stock Photo
    Colored scanning electron micrograph of protective dendritic cell of immune system.
    Colored scanning electron micrograph of cancer cells from human colon. — Stock Photo
    Colored scanning electron micrograph of cancer cells from human colon.
    Colored scanning electron micrograph of human mesenchymal stem cell. — Stock Photo
    Colored scanning electron micrograph of human mesenchymal stem cell.
    Freshwater diatom Licmorpha sp. — Stock Photo
    Freshwater diatom Licmorpha sp.
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree. — Stock Photo
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree.
    Soil bacteria, coloured scanning electron micrograph. — Stock Photo
    Soil bacteria, coloured scanning electron micrograph.
    Sperm cell with multiple tails — Stock Photo
    Sperm cell with multiple tails
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut — Stock Photo
    Crypts of Lieberkuhn. Light micrograph (LM). Crypts of Lieberkuhn of the colon shown in cross section. Crypts are long blind-ending tube-like extensions of the surface epithelial lining of the gut